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take a look at opposed engines mass produced. The sump sits lower than the cylinders. In a few cases the cylinders have stops to prevent pooling and promote draining, mostly solving the uneven wear issue. But I have never seen an engine with cylinders other than upright last longer than an upright cylinder design. Some came close, but I doubt many are installing rotary cylinder engines in their cars, at least for practical reasons.
Leave it upright. Angle it maybe, but not more than 15 degrees without modifying the oil sump for a better pickup or a dry sump system. If you really want to shave a few inches go dry sump. That'll knock 6-8 inches off the height of you engine.
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