hardwood floor and speaker

Don't make your wife unhappy! I have high quality wood floors and I use hockey pucks. Helps with a little bit of isolation from vibes traveling in either direction and are stable and cheap. Caveat, I don't think spikes really add much to sonic's except to stabilize the speaker on carpet covered floors. I don't subscribe to the theories about the cones either providing isolation or benefits by allowing vibrations to drain thru them to be dissipated by a wood floor underneath them. FWIW.

There are many discs designed to go under the spikes. I would consider a wool area rug under the equipment stand and speakers. When I took my carpet out I got one from Costco to put under them. Also one from RUGMAN that I put in the center of the room, it is quite good looking and helps the acoustics.

You can get various types of disks to put them on. I have some Clearaudio ones under mine, and Atlantis makes some nice ones as well.