The weight of the MV22 will allow install on the tile without the wood backing. We used toggle bolts on 3 cameras. However, it ends up a bit loose and any movement may weaken the tile area where the bolts go through (for example, when you take the cover off to adjust the lens). If I have to do another tile install (most likely next month), I will add some type of backing board.
Meraki now sells the t-bar bolts as a separate item. I believe MSRP is $25. I wish they were cheaper, or free on request. I agree no need to include them with every camera (to save on production cost), but offer it as a 5-10 pack for free or a minimal fee (not $25/each).
Esteban J Nunez
School and Church
K-12 Education