How to deploy Websense with more than one switch in network?

I manage a network of less than 50 users with a remote location that connects by VPN to our router.

I've been asked to find a solution for web monitoring, blocking, and reporting. We want to stop users from wasting time on things like Facebook, Youtube, and Instant Messaging. I'd also like to control bandwidth but not essential.

Cost is also a factor so I started to look at Websense Express.

To install Express I think one of the NICs has to be plugged into a span or mirror port on a switch. This might be a stupid question, but I have 3 switches. Does it matter which one I use?

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If your topology is something like: router<->switch1<->switch2<->switch3, you only need to configure port span in the first switch. The port connected to the router should be the source port, and the port connected to the monitoring computer be the target port.

This diagram might be helpful:

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