Why use epoxy grout? loads of Pros and Cons about using epoxy
Use powder grout and have no worries about cracks in the tile etc.
Cementitious grouts have been used for centuries without issues
All it needs is periodically maintenance, once a year
2000 years old Roman mosaic floors from the Villa Adriana, Tivoli, Italy. Romans could tile back then.
11 guest rooms, each one has a different design.
Liquid Nail is not for tiling. Period
If it was ok to use it on tile projects, the tile shops would sell Liquid Nail instead of tile adhesive/thinset
Those tiles might fall off the walls once the moisture kicks in.
To answer your question, the grout is not going to be flexible enough for the...