Like all things, you get what you pay for. If you're very careful in how you wind the cord inside the holder, it will basically fit ok, and at least so far, the magnet basically kinda holds mostly upright. You get what you pay for, though, and if you want something that's truly tidy, or holds truly upright on the wall, you might want a better-crafted model.
The main issue is that the second outlet isn't particularly accessible, unless you have a flat cord as pictured oh-so-strategically in the product image. The product sort of interferes with a regular plug- not so much as to completely block plugging something in, but they'll be fighting for space and touching. If your second plug is some kind of adapter with more of a box, I imagine you'd be sunk.
All in all, it's basically fine for now for my purposes for one or two spots, but I will be looking elsewhere for holders my remaining google home units.
Take Your Google Home Mini easily!