Oil leak on my 5 series, where do you all go for this?

I noticed a small patch of oil under my 2015 528i a few days ago and it's been getting slightly bigger each morning, so I know I can't keep ignoring it. It's not a massive leak yet, more like a slow drip, but I've learned the hard way that these things snowball fast if you leave them. The last garage I used for a different issue over-tightened something and caused a whole new problem, so I'm being careful this time. I came across bmw-garage.ae/leak-repair/ while looking around and it seems focused on this exact kind of work, but I don't know anyone who's actually used them. Has anyone here had an oil leak sorted on their BMW recently? Was it the valve cover gasket, oil filter housing, or something else? And did the shop actually diagnose it properly instead of just guessing at the rear main seal like everyone seems to do? I'm in Abu Dhabi so anywhere nearby works for me.