If you must install at a high angle you could also consider modifying the sump and weld a new deeper sump/well at the lowest point and route
the oil pickup to the new sump/well.
You may find high install angles require more oil in the sump so that the pickup doesn't starve in rough weather
or high heel angles. You may also require more internal baffles to slow sloshing oil.
You may also like to consider a "dry sump" as used in race
cars that pull high "G forces". A scavenging oil pump, external container for the oil and another oil pump to return the oil to the engine. A bit complex but it will work.
I run 2 X 410HP MAN diesels at 15 degrees with standard marine sumps and oil system with no problems.
Hope that lot helps.