Are all "Floor Protectors"& TipToes Created Equal?

I'm looking to protect the wood floors of my 18th century house. They've been there much longer than ever I will be, and from respect I'd like to leave floors without spike holes to the next steward of this house.

I need 16 of these items: four under my TT platform, three under each speaker, three under the equipment rack and three under the CD player.

Is one 'floor protector' or 'footer' (placed under equipment spikes, racks and the like) better than another?

Is one type better for speakers than for equipment racks? (my speakers weigh about 100 pounds apiece, all told)

Why? (just personal preference, or is there a musically relevant reason?)

Is one material preferable to another?

What has your experience been?

Thanks for your time and your thoughts.

David Kellogg