Spycoo16 It is possible that the lots you've been testing with are a problem. I'm happy to look them over in my game; just list the addresses. For the wood flooring, it's critical that you start at one corner and cover the entire lot in one go. If that doesn't work, undo the covering, then try starting from a different corner.
It's clear at least that the items are working in your game, so there must be something about the terrain or the lot in general that's interfering. I wouldn't think spawners would cause issues all over the lot, but just in case there's something invisible, it's always good to build a bit on a lot (a couple of walls is enough), then bulldoze in Edit Town before starting your actual build. That gets rid of most hidden items.