Hey there,
Welcome to the forum! Sounds like classic stress to me, triggered by the house move. Stress can cause UTIs so you really need to sort the stress issue out. Obviously you can't move back to your old house, so my suggestion would be to try zylkene to help calm them down. It's a milk protein and totally natural. I use it with my Bengal, Jagger when he's stressed and in general he will then use the litter tray again rather than elsewhere.
Of course you need to thoroughly clean where they have peed outside the box or they will return there. Use an appropriate pet cleaner and invest in a black light (they're not expensive) and it will show any areas you may have missed and if you have cleaned it all thoroughly.
As a UTI has been diagnosed, it may be that there will be bad associations with the litter box as well if pain was experienced when peeing in there. It may be worth trying a different type of litter to help bypass the issue. Also introduce a couple more litter boxes and have a couple upstairs as well so there is always one nearby. When I've had a UTI sometimes you just need to go so she will need a 'bathroom' close by or she may have an accident. Some of it might be the placement of the litter boxes as well now you've moved house. They might prefer them elsewhere. By introducing additional ones, you can see which ones get used and which ones don't.
Another thing my vet told me when Jagger was peeing inappropriately was to get a soft clean cloth and wipe his face with it and then go around the house, effectively marking it for him with his pheromones. Which will help them get their scent over the new house. Who knows, the previous occupant may have had cats they can smell and are stressing them out! They have been taken from their old and happy territory and plonked in a new and unfamiliar place and won't understand why, so I'm sure they just need a helping hand to settle and establish their new territory.
Also feliway plug-ins are good and worth a try if you haven't already.
Hope this helps give you a few more ideas to try and I'm sure others will be along to give advice too. I can't recommend zylkene enough, I turn to it regularly with Jagger when he has peeing/spraying issues!
Good luck!
_________________ Clare Hendrix and Jagger, Brown Marble Boys (born 18 August 2013) Hampshire, UK
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