EMS, right behind panel, short run, easy to access, out of the way
ADAHRS, up high in home made bracket behind baggage bulkhead, search dynon adahrs on here and you will see great mounting set ups.
Servo harness yes is long enough but dont waste much wire. Call the supplier you buy it from and tell them the model etc and they will set you up. I worked with Ryan at ACS and he made it simple.
Ever head down to cyqg stop in and happy to show you mine and take you for an rv ride. Blue skies.