Everything you have read about the rule of 3 for dogs....triple it. We rescued last July and it takes a lot longer for European rescues to settle than you think. You need a permanent safe space for them to hide when they are overwhelmed, and with us this happened a lot, especially with certain house noises e.g. hoover, post being delivered, a blender....anything "new". This can be a crate, or a bed by the door, up to you, but they need to know they are safe.
We also left her to her own devices, in a spare room, so she wasn't overwhelmed by us constantly wanting to pet her....they may not like that if they are not used to it!
We still struggle with overnight pees and poos. Not as frequent, maybe once every 2 weeks now, so purchased a washable incontinence mat to use instead of buying hundreds of pee pads! Saved a fortunate, goes in the machine, and easier to keep the room clean as we went for a 2m x 2m pad.
We dog already, and still do, and in some respects this helped her settle as she had a companion showing her the ropes, and she had come from a litter of 3, but that doesn't work for all rescues and we still don't let them have big treats in the same room, and they are still fed in different rooms.
Ultimately you need a lot of patience....don't expect them to love you back to start with...and give them space and time. Time in particular is very important.