Level the floor

Yeah, I had no idea to even start with this.  For example:

You could try something as simple/cheap as hockey pucks.

I had no idea!  (I don't suppose there's a preferred brand of... no no no ignore that.)

So, first: thanks for the questions.  Somewhere to think from.

Type of floor: carpet on top of concrete.  Changes to the carpet, like cuts of sections, for example, are out of the question.

Adjustment on the front of the system stacks: I'm guessing the question there is, can I change the shape of the equipment stack itself?  If so then the answer is, "no", it's a series of steel needles on a metal frame.  For this part, I think "pucks".  Done.

The speakers are my main concern.  Each channel involves two sections:

A small, light channel expects to run near eye-level, standing some inches away from the main stack.  Here too I think "pucks", done.

The primary speaker stack is my chief concern.  It weighs about 120 lbs, measures about 20" deep, 16" wide, expects to sit near floor level.

These speakers are known for being room-sensitive; tweak, shove, tweak AHA!  Glory!  ...so adjustability is important; standing it on sets of spikes of adjustable lengths wouldn't be good.

Currently I'm thinking: first layer, pucks; on top of that, a flat sheet of something that we set between the speakers and the pucks.  "Something simple and cheap" would be grand, but nothing is springing to mind.  Stability is obviously important, non-resonance...  Light weight would be nice, but flimsy would be bad.  Ugly, I don't care, sheets of fabric solve all things.

I do have some access to tools.  While "two circles of steel" would be a dumb idea (uh, right?), something similar to that might not be out of the question, depending, maybe.

Thanks, all.

Leveling your listening space/chair is a big deal...one more thing to check off tweaking.I used lazer to get as close as i could ear level listening chair.

Yeah.  At this point, cushions atop chair, mix and match, but, yeah.  One issue at a time.

I think you are on the right track. If you have some Mooney, you might go for Black Diamond Racing Carbon Fiber platforms… then use Vibrapods, or audio pucks (there are many variations) under the platforms. Short ones under the high side and thick ones under the low side. 
 

It is not expensive to get scrap granite… and have it cut. I use this for my amp… with vibrapods under and Nobsound springs above.