MX records have same IP not useful?

#1

My new port from fuse mail to mxroute is working fine so far.
As per my welcome letter using mx records as specified.

Doing a dns check on using
https://intodns.com/midiextender.com
yields a
ERROR: It seems that all your MX records have the same IP(s):
There is no use on having multiple MX records pointing to the same ip.

That seems like a valid concern. I would expect point multiple mx records is redundancy in case one ip fails for whatever reason.

Should I be using a different mx record as an alternate?

#2

The goal of the backup MX record is to reserve the ability to add backup relays later. For the most part backup relays are not a big deal because MTAs have the job of retrying emails that can’t be delivered due to connection failures, which means that downtime does not result in lost inbound emails. However, I want room for unusual circumstances or a change in behavior, and this way no one has to make any changes to facilitate movement in that direction.