Control two elk M1s?

Can the eKeypad M1 or the eKeypad pro support two elk systems? I'm looking to control both my primary house and my vacation house. Both would be on the internet.

I have pro and I control two systems

I believe you can add multiple systems to either app.

Yes. eKeypad Pro can control multiple M1 panels. I know of some installers that have almost 40 configured.
 
eKeypad also support an optional full consolidation mode allowing you to intermix the details from both systems so you can easily see the status of both systems at a glance. This option appears automatically in the configuration screen under "Automation systems" after you add the second system.
 
This multiple system capability is also available in eKeypad M1 as well but you must add an optional module called the "Multi-system Module" first.