I have a wood floor on concrete so not an issue with weight.Good!
Another factor that should be considered is how all this equipment will be powered. Assuming 120 volt AC the four McIntosh amplifiers have specified current draws (presumably when outputting maximum rated power) that total 44 amperes, although under typical listening conditions I would expect that number to be much less. But the current draw of multiple subs on high volume bass transients will add to the total considerably, at least for brief instants.
So it would seem probable that dedicated runs from at least two 20 amp circuit breakers will be necessary.
Regards,
-- Al