SSL VPN Certificate default or paid. safe?

hi im using ssl vpn with the sophos SSL cert. 

my question is do i loose security by using sophos cert and not a paid ssl cert?

doesn't Sophos use the same SSL cert on all firewalls? or do each firewall has it own self sign cert?



Edited TAGs
[edited by: emmosophos at 6:46 PM (GMT -8) on 25 Feb 2021]