I thought you got one trophy for defeating someone at an equal/lower PVP rank, and two trophies for defeating someone higher.
Here is a pair of screenshots that suggests I am mistaken.
In this image I have a lower rank than my opponent, but I am only offered one trophy.
And indeed, that is how many trophies I received. I unfortunately don’t know if my guild was actually awarded two trophies; the counter went up by more than two during the fight so I can’t say how many are mine vs my guildmates’.