Yes, you can install a 3850 vertically. As for wall mount kit see link below:
https://www.racksolutions.com/wall-racks.html?gclid=Cj0KEQjw4827BRDJvpbVuKvx-rIBEiQA2_CzsFPZBB0fNlmhUtQLuxpSqQkP9vw5baTd4OAmJkfv_RYaAhqc8P8HAQ
They are standard 19' kits.
HTH