My main US data center has two MX400s with dual internet links for both and a heartbeat between the two. Running 13.33, zero issues. Its been this way for around 2 years? Most other head-ends/DCs are single internet (per MX) with heartbeat between the pairs. One important note though, each MX single threads to the upstream and downstream switches, they do not cross-connect at the distribution layer as shown in Meraki's updated drawings. I already know what you are thinking and will say, so no worries. However, keep in mind the Meraki gear we have deployed is in parallel to our core Cisco infrastructure, but again, I know the routine 😉
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