I put four strap toggles rated at 80lbs each. I was in the the same predicament as the OP. I spoke to some of the Home Depot experts who swore by them. I've never had an issue. So, when it was time to replace the old big screen down in the family room, I used strap toggles again. Works like a charm. The cool thing about the family room installation is that our crawlspace is right behind that wall. So, I'm able to check the back side of it to see if there is any movement. As of about 10 years, none.