Yes. The surrounds (including Atmos) do not need to match your mains and center. Even though it is convention, your center doesn’t necessarily need to match your mains. (But that gets complicated.
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)
Having the voicing match well between your front three, and having a center channel design that promotes clear dialog is what is important. Matching brand and model (ie using all Monitor Audio Silver) goes a long way to solve for the first. Research and auditioning is the only way you can guarantee satisfaction in that last point.
$1500 for new front 3?
Can you consider using all matched stand mounts across your front, or do you need that horizontal center?