It's a good question i've been thinking about
I have my HX35's plumbed off the oil sending unit. I've often wondered if I'm losing a lot of oil pressure in the motor, through those oil feed lines
So far though, no issues...
And yes, HX35's are low oil pressure turbos. Meaning, they do pretty well with our pontiacs. You try putting an HX35 on a honda or DSM vehicle that sees a lot more oil pressure in the engine and they won't like it at all. You'll need the restrictor
Lower oil pressure (40-60 is probably fine) and a big oil drain for holset turbos = good
If i were dead set on the rear setup...
I'd have one of those fancy smancy pumps feeding the turbos. I'd probably have a guage on the pump to see how much pressure is in the line...out of curiosity
And I'd have an oil catch below the turbos. Immediately below, if possible. Let the turbos drain via gravity directly into that reservoir....and have the single pump feeding out of it
Relatively simple, considering