Great question! You should certainly be able to have multiple Slingboxes on the same network. However, the biggest limitation to this would be the stability and upload speed of that network. To help you get an idea of the bandwidth requirements you're going to need to meet, check out the "SlingPlayer Bandwidth Requirements" chart linked in this article:
Also, if you encounter any sort of network issues when installing your second Slingbox, check out this other helpful article:
Hope this helps!
Sling Media Forum Moderation Team