It’s hard to tell from the vid, but it looks like surface Mount LAWs. I’d recommend something like an under the mirror light with an intersectors b/c all the dirty work is concealed underneath the mirror (with wedges, you should be able to get a decent angle) & away from turn signals
Like Seth said, foreign vehicles are a pain in the ass to pull apart!!!! Things as simple as removing the grill are even a headache b/c so many things are interconnected, and the light housings that I’ve come across had thicker walls, so more of a pain in the ass to drill LAWs into. That being said, I wouldn’t recommend LAWs, but I also would not recommend HLF/TLF flashers, b/c I used to have a Passat (with no aftermarket add-ons) and the junk computer always set off alerts for no reason, so I’d imagine that aftermarket flashers would just be more of a headache. I’ve seen a bunch of slicktop setups on german cars, but I have no idea what flashers they use over there, b/c I don’t ever see BMW, Mercedes, VW, etc listed on the flasher compatibility charts
Aside from the intersectors, I’d honestly just recommend a dual dash light and something on the rear headliner, & calling it a day