The HTC Vive Base Stations are a critical part of the HTC Vive's tracking performance. There is a certain way that they must be mounted. My preliminatry research has taught me that they can be mounted on a wall, on a shelf, or on stands. Let's look at how others are mounting their HTC Vive Base Stations.
This video gives you an overview of your options for placing the base stations. Mentioned is wall mounting, using stands, and clamping them to book shelves.
This video goes through the complete setup of the HTC VIVE.
A detailed guide on how to best position the HTC Motion Tracking Boxes (AKA Base stations) comes from tom's guide. This should help you if the setup video mentioned above doesn't give you all the details you were looking for.
A lot of people don't want to drill holes in their walls. Or they want a setup that can be transported to different locations. If that's the case, you may want to see these suggestions which include using a tripod, using mounting tape, or as mentioned previously, placing them on shelves.
If you'd like to work with PVC pipe, you should check out this video on making inexpensive mounting posts for your HTC VIVE Base Stations.
There are a lot of stands that can be bought on Amazon for the HTC Vive Base Stations.
The Fovitec - 2x 7'6" VR Gaming Lighthouse Mount Stand Kit is Amazon's best selling and top rated stand kit. It is a stable mounting solution that can be collapsed and stored in the included bag.