This is from my friend's case. He rented 2 weeks AirBnB for his parents to quarantine. For your case, if your parents are staying with you, you will need to have a separate washroom, otherwise, it is impossible to quarantine.
I would highly recommend rent 2 weeks AirBnB accommodation, many Airbnb is renting for quarantine in my city (Vancouver), I am sure there will be in others. The reason I recommend this is that I don't want you to run into the risk of denying entry, after a lot of work done, a few hundred dollars is nothing compared to the effort.
Also, your parents need to have a Covid19 test as well before flying I think.