8 lanes per GPU is plenty, the performance diff with 16 is ~3%. Games will run faster with SLI setup on Ryzen. Why do you even need SLI, 1080 Ti will be good enough for 5K gaming.
Please try again when you need to juggle 1,000+ video feeds simultaneously and truly understand what REAL power requires.
Allow me to introduce you to Camfrog. Absolutely consumer, boss.