Side mount bro, law doesn't state it has to be dead center of the vehicle does it? order in a side mount bracket, there are ones on remote that lay flat and hide for shows and what not, could really go custom with it and get the use of the plate filler.
Oklahoma doesn't require a front plate either, Texas does and I was pulled over for not having one once and told the cop to F* off because I don't have to because Oklahoma law doesn't require it and I was only given 1 plate when I registered the vehicle.