I own a glass chair mat - I’ve had it for a little over a month now. I got sick of the plastic ones getting dented up. One “mid-pile carpet” chair mat from the office store had a non-usable dent in it within 24 hours! Those plastic ones are a joke.
The glass mats are all about 1/5 - 1/4" thick, and heavy as hell. I grabbed this one:
https://www.amazon.com/gp/product/B07K95V7X2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
and I’d previously upgraded my chair casters to:
https://www.amazon.com/gp/product/B08CSGXTLD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
mostly to squeeze another inch or so of maximum height out, and in a futile attempt to try and get the chair to roll nicer on the carpeted floor (which was a failure).
I haven’t had any issues with stubbing my toe or anything, but make sure they’re big enough for your space - if the chair rolls off the edge it’s definitely noticeable. Mine is very solid and no issues so far on top of the mid-pile residential carpet. The caveat is that the chair mat very much sits on top of the carpet, so it adds a bit of height to the chair. Probably not an issue, but just in case it is, be aware. 
Also, glass can be cold. So if you’re doing the home office sit/stand thing, you’ll probably want some sort of slipper / shoe.
Either way, I’d definitely recommend glass mats!