We used Blueberries as our main nappies for nursery (poppered ones) and they had no problems at all. When I had to work more hours I sent her in fitteds and wool as that was what we used at home, and they had no problems with that either, I just made sure it was one or the other each day (ie all fitteds or all pockets) rather than swapping systems iyswim. If I needed to stretch my stash and use an odd nappy I would put it on in the morning, as then they just had to figure out how to undo it. We never had any problems.
we send 5 easyfits, reusable wipes and water in a tupperware each day. my schedule is so busy so i find it easier to make up all the nursery bags on sunday evening so i don't have to keep doing them each evening. for this we had to buy 20+ easyfits but that's okay, we bought them all preloved and it makes my life much easier. we use wool and fitteds at home but this didn't go down well at nursery so have stuck to easyfits x
I send ME sandys with ME airfow wraps and fleece liner. I tell them to change everything at every change and send them poppered on the right poppers so they know how tight to put them on. I have had no problems. Our nursery only changes at 11am and 3pm, but are more than happy to change the cloth I send every 3 hours at my request so they change at 10am, 1pm and 4pm (and immediately if she poos). I also send washable wipes which they wet with water and a wetbag for them to use.
Our nursery supply disposables and have never had a child in cloth other than my 2. My 2 have been changed by about 15 or so nursery nurses as Christopher was in cloth until 2 years and 10 months and never a single leaky nappy!
Yep poppers should be fine as long as you tell them which poppers to do up, otherwise they will probably put them on too loosely You could mark them, or just tell them to count, ie 2nd ones in on the top and 1st ones on the bottom