My dad does it that way. I’ve got to to say, fallow are a bit larger than roe so if one of them came down, it might be a bit of a mess! Saying that though, I have only used the one method as I don’t use plaques.
A piece of wire in through the back of the skull, with both ends coming out of the hole to the neck (sorry, my English is carp!). Tie the wire into a loop. I would attach/screw in some sort of hook onto the plaque and basically hang it off.
I’ve attached a few photos that I have, some with roe and the others a single fallow. The fallow is at about 7ft off the ground so you can’t see the fixing.
On the roe, the wire is on the outside as you can stick it up without it wanting to fall off the wall. Different with fallow and red.