Kirk,
Floor material is unimportant. On Druids, you just have to set the floor-to-baseplate gap correctly. On Definitions, no issue here at all. Definitions also have a vertical dispersion pattern that minimizes floor and ceiling effects.
You will likely want some toe-in for best imaging, but not always. Experiment. Both my Druids and Definitions systems have speakers toed-in. Druids will give you a sweet spot about the width of 3 listeners at 7 - 8 ft, more from further away. Fall-off is gradual. No practical problems there. Definitions project a soundstage sufficiently dispersed to provide a wide arc of home theater viewers a fully enjoyable sonic experience with dialog anchored to the lips of actors on screen, so on music you'll find the sweet spot ample.
Both speakers can be used in close proximity to back and side walls with no trouble. Depending on your room, the depth dimension of the soundstage may slide forward some, as you get closer to the wall, but this is highly variable person-to-person and room to room. Both of these speaker designs give you considerably more room placement flexibility than the majority of speakers.
Phil