Unless you are flying into a Scottish Airport you will not get a Scottich Government Quarantine hotel.
There are seperate websites for Scottish airports and English airports to book if required. Also if you transit through Dubai which is red or any other red countries then its Forced Quarantine.
If you fly into Heathrow from Red country you will be quarantined in a UK pre booked Hotel. You have to pre book when travelling from Red country and prove payment. If you fly direct without booking hotel and are required to Quarantine in hotel it will be pot luck. Have 2 friends that recently did this without booking and they ended up being driven by Coach to Birmingham. Took them 7 hours on bus with no toilet facilites to the quarantine hotel.