My favorite means of mounting a brick is to use a large pair of Velcro. For undersides on some IKEA tables, I once had to augment the Velcro pad adhesive with Gorilla Glue. Sometimes I use zip ties instead of Velcro.
When buying extra bricks, in addition to the presumed-good one that came with the laptop, I advise going to some effort and guesswork to try to get genuine, non-counterfeit ones. I've seen some corner-cutting in circuitry in other power adapters and chargers, and that seems like a fire hazard.
For people who don't like the idea of bricks plugged into the AC when not in use, Leviton and others make little switches that plug into the AC outlet.
Is it against HN norms to put a specific recommendation here? I'd love to know some reliable chargers in that range.
90w charger: https://smile.amazon.com/dp/B083ZBXXN5/
I'm laying on my couch right now, with my laptop plugged into a brick perched permanently at the end thereof. There are two more at the table (sometimes work and personal laptop are up at the same time), and one on my nightstand, and one in the kitchen for when I'm using a recipe from online or just youtubing while cooking.
All my old Thinkpad bricks with the gray round plug have little converter cables on 'em, so they work with the modern yellow rectangular socket now. I got a new brick with the work lappy, a new one with the personal, and I think there's one knockoff cheapie in the mix somewhere.