Hello David,
I understand that you plan to have single screen to monitor different databases. For this you may use dbacockpit. Details of configuration and support are provided in the links below.
Note 1027146 - Database administration and monitoring using the DBA Cockpit
http://help.sap.com/saphelp_nw70/helpdata/ja/c4/b5f88a4252e24e8aab40a956d571c8/content.htm
Regards,
Deepak Kori