Couple quesions about Dashboard widgets and OpManager 12.3.024

Good afternoon. We are setting up a NOC dashboard for a big screen and i am populating it with lots of statistics concerning the state of servers, however i have a couple questions.

1. We have multiple sites, with a Datacentre in each and want to create a widget that pulls the temperature from each site and displays it. Currently i have a widget for each site and was wondering if there is way to pull data from multiple machines into one widget? The only one i can find is Min/max/Average widget which is not appropriate for the temperature of the datacentre.

2. Can i display the NOC onto the big screen without login? Just accessing a website?

3.Some widgets seem to autosize depending on data within.. Is there a way to fix the size?

Many thanks in advance