Welcome to sunny Belfast.
As said before the scene is very quiet at present. as regards the sites Escort Ireland is pricey so any one it must be getting business, though no negative reviews ever make it to view.
Adultwork , search NI, and Antrim for Belfast area, has a mixture o f'always there ' girls and touring ones use your own initiative.
Vivastreet for the cheaper end of the market , some OK others just B&S
Avoid Locanto it's toxic with lots of scammers. I've never used it but the stories are out there.
Local guys here can tend to use regulars and may give a review or may not. I'll not mention names but if you have full access here look at some guys reviewing on the NI section and check there back reviews. Some of the girls have been about a while , you decide what that means. Should you be wary of parts of Belfast stick with city centre , BT1 BT2 even BT7. BT9 can be dodgy , it's bedsit land in part so lots of foreigners , etc. possibly organised.
Good luck!!