https://www.utopia-asia.com/indobali.htm
This has been the most useful site for all things gay in Asia. This is the sub-link to Bali & you can refine further to massage. I’ve had a great time at all of them, especially when you get to pick from a good line-up of guys. Tell the receptionist up-front what you want: top, bott or vers. Great places to go during the hot middle of the afternoon.
Be sure to check the dates of postings as they do post recent ones, but don’t take down really old ones.