You really need to go have a listen.
Yep,
some sort, for sure
The Logitech satellite speakers are 8 Ohms, and when running with their own sub they're good for games and okay for a bit of background music as long as you're not too fussy. But as a standalone satellite to partner with proper AV gear? ... Not really up to the task.
Try them by all means. Stick them on the Piccolo in place of the Diamonds and see how you get on. I think you'll find them rather rough-sounding and lacking in midrange. It's the single driver that's the issue.
There's no separate tweeter/mid driver combo that you find in most proper AV and music speakers, so they're trying to make a large diaphragm speaker do frequencies where it struggles. The bass is limited too because it relies on a fairly high crossover point from the sub to fill in the sort of frequencies we associate with male speaking voice and the deeper end of the female vocal range.
I think you might squeak by with them as surrounds for a while because that's less critical. I wouldn't bother with one as a centre though. Run the front pair in phantom mode - this is where you set no centre speaker so the AV receiver sends centre dialogue to the front stereo pair much in the same way as Hi-Fi works. This will sound better than the centre soundtrack getting mangled by the Logitech.