Racks, equipment and footers

I would like to get a new rack and isolation footers for the rack and/or equipment. The high-end stuff like HRS, might be best, but it's out of my budget. There are so many choices, especially of footers. I'm thinking of going with a nice enough wood rack for aesthetic reasons and footers under each of the components to maximize performance. The system is upstairs with a wooden floor.  No turntable. Questions:

• should I put footers under the rack and/or just the components?
•  What about spikes - to drain rather than springs, so I avoid springs interacting with springs
• if I'm going to put footers under each component, does the material,  construction, weight, etc. of the rack still matter much?
•  It would be cheaper to just put footers under the rack and leave the components with the rubber feet -  is this less effective?
• Should I put the same footers under all the components, or is it mix-and-match?

Any thoughts welcome along with specific recommendations on footers.