Affordable replacement for my returned Mova Z50 Ultra?

My Mova Z-50 Ult completely stopped mopping, so I returned it to Amazon for a full refund. Now I’m looking for a robot vacuum in the £300–£500 range.

Most of my floors are carpet, with a bit of tile in the bathroom, kitchen, and en suite. I live in an upstairs apartment with open stairs, so it needs to have good cliff detection to avoid falling down.

No pets, no kids, would prefer a roller mop but it’s not essential, and compatibility with Home Assistant would be nice since the Z50 wasn’t, though that’s not a dealbreaker either.