Do Sophos "Frisbee" CEILING MOUNT ACCESS POINTS Work FACE UP as Well as Face Down? (AP 15C, 55C, 100C ...)

They have radiation graphs for in the brochure (https://www.sophos.com/en-us/medialibrary/PDFs/documentation/sophos-operating-instructions-apx-320-530-740-oina.pdf) for newer (APX320, etc) models and I would assume that the construction is basically the same. It's a little hard to figure out exactly what they indicate, but I assume the YZ axis view is what you want, and it looks like 5GHz might be troublesome upside down. In addition, sitting it on top of a cabinet would immediately degrade whatever signal goes "down"  through the cabinet. It would make a lot more sense to wall-mount in a relatively-unobstructed position, in my opinion.

I'm using an APX320 that's mounted on a hollow-core door with velcro -- long story, essentially wall-mounted -- and it's working well enough for me. (Including off the back/"top" side, but I'm only going maybe 40 feet.) But it has unobstructed line-of-sight to key devices (off of the front) and mostly wallboard between it and other devices. If your cabinets were wood or metal, I wouldn't count on laying it on top working very well at all.

It really depends on how far you want it to work. If it's WiFi for devices in a small study that will all within 10 feet, maybe almost any placement will work. If the cabinet is hardwood or steel, I wouldn't count on anything working well with it laid on top.

They have radiation graphs for in the brochure (https://www.sophos.com/en-us/medialibrary/PDFs/documentation/sophos-operating-instructions-apx-320-530-740-oina.pdf) for newer (APX320, etc) models and I would assume that the construction is basically the same. It's a little hard to figure out exactly what they indicate, but I assume the YZ axis view is what you want, and it looks like 5GHz might be troublesome upside down. In addition, sitting it on top of a cabinet would immediately degrade whatever signal goes "down"  through the cabinet. It would make a lot more sense to wall-mount in a relatively-unobstructed position, in my opinion.

I'm using an APX320 that's mounted on a hollow-core door with velcro -- long story, essentially wall-mounted -- and it's working well enough for me. (Including off the back/"top" side, but I'm only going maybe 40 feet.) But it has unobstructed line-of-sight to key devices (off of the front) and mostly wallboard between it and other devices. If your cabinets were wood or metal, I wouldn't count on laying it on top working very well at all.

It really depends on how far you want it to work. If it's WiFi for devices in a small study that will all within 10 feet, maybe almost any placement will work. If the cabinet is hardwood or steel, I wouldn't count on anything working well with it laid on top.

Interesting, Wayne.  I've not learned how to interpret those graphs, but your take on them makes sense to me.  Thought I'd run a test at home...

I have an old AP 10 upstairs in our guest room beside the quiet PC that runs UTM.  It sits upside down on top of an empty dresser.  My home is a two-story house built in 1937, so construction is all wood - no concrete between the floors and all hardwood floors.  Downstairs underneath the AP has a great signal. My spot is an easy chair 40 feet away from the AP.  Through two interior walls (wood & plaster) and the upstairs floor, I get an adequate signal for my usage:

                                 down/up
     Service to home:  250/10
     Beside the AP:     38.7/5.9
     Underneath AP:   38.4/4.7
     My easy chair:      8.5/1.9

Cheers - Bob