Can the FR-1 be mounted on the wall/ceiling and tilted down towards my favorite chair?
You can mount FR-1 speakers on any standard 100×100 mounting bracket. If they are off the wall, you will be missing energy in the lowest frequencies, which will not be a problem if you support them with a subwoofer.
Can FR-1 be used as a center speaker, lying down?
This is not recommended. The FR-1 is a two-way speaker with a passive radiator. It is not a center speaker design, and dispersion is not optimal when the FR-1 is lying down.