How should I place my hand when playing SDVX? (And also any other tips?)

I have been playing rhythm games like osumania, arcaea, lanota... for 7 years now, and I am in love with a LOT of SDVX songs for years though never played it. When I heard that theres an arcade with sdvx nearby I RUSHED to it and hell I had a lot of fun.

I think I do have some basic knowledge and I can already do some 11/12 on my first try. However I found it very challenging to hit FX notes and to take care of the lazers simultaneously. Currently I place my thumb on FX buttons and other fingers on the regulars. Yet sometimes it feels redundant and I cant move my fingers fast enough to hit some particular patterns.

Is there a more optimal way to place my hand? Should I have my fingers rest separately on the buttons like how I play osu mania or?