There are no LGA 1151 multi socked motherboards. Also there are no consumer-grade LGA2011 motherboards.
For that use case you either want to take a look on a 8 core/16 thread i7 (which are unlocked) for the LGA2011 platform of a Xeon (which are locked) on it's desired, server/workstation-grade platforms.
For the Xeon chips there are dual socket boards and CPUs from 4 cores/8 threads all the way up to 24 cores/48 threads.