You need to check on your reporting requirements and who is going to run them for which site and then place AW/Webview servers in the proper timezone, the same goes for any admin script. Setting 2 time zones might give your customer some
administrative overhead or might enable them to achieve some flexibility, it is difficult to say without knowing all the details, this is something you might discuss with your Cisco SE for the best approach in that scenario.
This URL should help you:
http://www.cisco.com/warp/public/78/client_aw_chklst.shtml