That's correct. Hubitat does have inbuilt drivers but @markus recently developed some new ones with presence built in here so I am not running that driver. btw, to add then you just use a paper clip and press into their pairing button on the side to add them into HE.
Sounds like you need a bunch of IKEA repeaters mate. It's worth trying it. IMHO $20 is a steal so just grab them now, not sure on IKEA sales etc.