How the heck are your toddlers walking all over HDMI cables? I'm just thinking of my setup and I cannot figure out a way that a child would be able to step on any of the cables. Don't you have your TV or monitors on stands or desks?
i have my projector on the middle of the living room table. we have a 2 story vaulted ceiling so we can't have a ceiling mount. we haven't run the cables under the hardwood at this point so it's just exposed wires. usually the kids know to go to the left, but when they go crazy and chase each other, common sense goes out the window and they run in circles and trip over the cables once in a blue moon. after 3 years, only 3 cables have 'gone'. so it's not too bad.
we're moving or i'd run them through the floor trusses.