Hmm I can't honestly say I'd recommend fitting a none tested anchor point but that's up to you. I don't know what options you have for the second seat in third row but for middle row you can have an anchor point fitted above the barn door in roof and if your model doesn't have rear ac I believe you can have one fitted in front of the rear roof light which will make it close to middle row and eliminate straps slipping down between seats as the point is high.

CRA Bar is no where near roof. It will be just below the top of middle row seats that bolts from one side of car to the other where the square tabs are in trim.