>>371637507
>>371638281
2.0 base stations do NOT require a clear line of sight and don't even have a slot for a sync cable. They do however have a max distance they support.

>>371638645
>>371638929
It's possible that the material in the fan interferes with the base stations' bluetooth communications with each other, in which case getting the fan out of their line of sight would be beneficial.

Also according to a forum post by a vive techincal support person,
>Basestation 2.0's should be no more than 5.5m apart from one another under a standard use case. Exceeding this distance will result in SteamVR displaying error messages and tracking degradation.
https://forum.vive.com/topic/9011-distance-between-base-stations-10-vs-20/