Herbies Pucks floor spike protectors...

I’ve used quite a few of his products over the years. He’s easy going and let you know what product to choose. I never use the spikes, even with carpet. He had a product years ago that replaced the speaker feet with a much better non-abrasive concept. I always try and use a wood platform under my speakers with the upgraded feet on that.
You can spend more elsewhere for basically the same concept, but why?

You can't easily get Herbie's products here in the UK so I make do with sorbothane or similar.

However, everything I've read about them seems to make straightforward sense. On a solid floor like yours they may be less effective than say on a suspended floor, but it will still depend largely upon the way your speakers have been constructed. 

I'd say it's well worth a try.   

I use them with my Vandy Treo’s. I use them to protect my wood floors.
I can’t say that they either help or hinder, as I would not put spike marks in my floor.
They also help with moving and adjusting the speaker as they glide easily.
FWIW,
I’d be worried if those spikes could put a chip or make a crack in travertine.
Bob