Use proper size oil return lines and it doesnt matter what level the hose is connected at, it matters where the turbo drain outlet on the turbo itself sits compared to the oil level.
Its simple physics, the fluid will level itself out, so long as the hose is large enough to not cause any restriction that slows the fluids ability to level off.
There are turbo kits that drain the turbo oil back into the oil drain plug.
Also, I have my turbos draining into the Greddy oil pan. 10,000 miles later, no issues.
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