I have 1.5" foam board glued against concrete block, but a framework has not yet been erected in front of it. I want to attach a 2'x3' piece of plywood to the wall (it will act as a homerun point-of-contact for all cable aplifiers, phone, and ethernet hub wiring), but I'd like a second opinion on an effective mounting tactic. I was thinking four toggle bolts, one through each corner of the board, foam, and into the block. Everyone's thoughts?

Thanks,

Dan