I disagree! They can be great options, inexpensive and reliable. My current home server is a Dell r620 with xeon CPUs, 64gbs of RAM, and 2 terabytes storage in raid 5. It serves several vms, a mix of Windows and Linux. More than enough for many home set ups. Boots the os off a 16gb flash card. Cost me $185. Thing has been a tank.
I bought two short L brackets from home Depot, and have it hanging flat against the wall. It’s been fabulous.