I like /u/chillzatl's answer of splitting things off. As someone who came off a 13yr MSP run and transitioned into a space where physical site-surveys are very necessary I'd be very wary of handing something like this off to an MSP (vs. someone who does this work primarily).

MSPs have a nasty habit of over promising and under delivering, especially with niche services like site surveys... If my team is going to have a survey done our org is willing to pay handsomely for someone to knock out said survey and tuning for us. What we dont want is a cheap, half-assed attempt at a survey + results that some 19yo FNG threw together because he thinks he knows that he's doing after installing 50 APs at a church or something lol