Components on floor

I’d say lord in heaven no if not a concrete floor.  Even so elevating a bit makes use easier.  If foundation level and any chance of flooding,  definitely no. Distance from any nearby electric devices always desirable just in case. 

OP

just isolate the hard wood from the concreate floor. It should work

Get some butcher block boards that fit under each component, under the blocks put your favorite footer. 

@dbphd 

I agree with @ghdprentice, I would avoid placing sensitive equipment close to the electric fireplace. Besides heating elements, the fireplace contains fans, LEDs to illuminate the faux flames, and all sorts of control circuitry. Lots of opportunity for undesirable electrical noise.

Users manual here https://www.dimplexstore.com/dimplex-ignitexl-60-inch-linear-electric-fireplace

Two words: vacuum.cleaner. 

Also, do you like standing on your head to adjust the volume? 

Can someone please explain the supposed advantages of putting your equipment on the floor?