Deploy Exchange 2013 Edge Transport Server for multi-site environment

Hi,
I have a multi-site Exchange 2013 environment. The configurations are as below.
Active Directory Sites and Exchange Servers.
SiteA - EXMB1 & EXCAS1
SiteB - EXMB2 & EXCAS2
SiteC - EXMB3 & EXCAS3
All sites are connected via VPN. (Good speed. No latency issues)
All the three Mailbox Servers are in DAG. Only one mailbox database. All servers running Exchange 2013.
I am planning to deploy Edge Servers in the infrastructure (I am doing it for the first time). Normally, it will be in DMZ.
Now, I can deploy 2 Edge Servers for reliability.
Question.
1. Can I deploy 2 Edge Servers and create subscription to all the mailbox server in 3 different site? Or, is it like one edge server can make subscription to only mailbox servers in one Active Directory Site? I am not sure about this and could not find much
information from TechNet.
One Edge Server can make subscription to all 3 mailbox server in 3 sites. Similarly, I can make the subscriptions in the second edge server as well. Configure 2 external MX records with the same priority so that there will be some load balancing.
Also, in such a case if the mailbox database become active from a different site, I need not make any new changes to the Edge Servers right?
2. If the first way is not correct, I will have to deploy 1 Edge Server each for each of the Active Directory Site. (In DMZ only, not in domain)
Make Edge Subscription to the mailbox server in corresponding site.
Make 1 MX record and point it to the Edge Server which is subscribed to the Mailbox Server from which the Database is Active. The problem is, every time will have to change the DNS record when ever the database copy is activated from a different mailbox
server. And the issues with propagation.. delay..
I am not sure which of the above 2 ways will work. Appreciate suggestions from anyone who have previous experience with similar infrastructure.
Thanks in advance. :)

Hi 
One or more Edge Transport servers can be subscribed to a single Active Directory site. However, an Edge Transport server can't be subscribed to more than one Active Directory site. If you have more than one Edge Transport server deployed, each server can be
subscribed to a different Active Directory site. Each Edge Transport server requires an individual Edge Subscription.
A subscribed Edge Transport server is associated with a particular Active Directory site. If more than one Mailbox server exists in the site, any of them can replicate data to the subscribed Edge Transport servers.
I don't think there is a solution to subscribe  edge servers for more than 1 site. Edge Servers can be scoped only to one site.
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com Thanks Sathish
(MVP)

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