Agree with much of what has been said.
--You can easily and discretely mark the preferred listening spot on the vinyl floor
--Would pick the heaviest/highest quality casters you can find. I have seen some that have a rubber contact surface that will not mare your floor and be smooth rolling. Locking casters would be best in my mind.
--I would not be thrilled with drilling my speakers. Would make an mdf or plywood base 1 1/2" thick with a nice wood skirt. I think it would look good and perform well for you
--You can easily and discretely mark the preferred listening spot on the vinyl floor
--Would pick the heaviest/highest quality casters you can find. I have seen some that have a rubber contact surface that will not mare your floor and be smooth rolling. Locking casters would be best in my mind.
--I would not be thrilled with drilling my speakers. Would make an mdf or plywood base 1 1/2" thick with a nice wood skirt. I think it would look good and perform well for you