I am a little confused by your question. You have to setup dkim and dmarc and SPF records to avoid spam filters. Services like mail-tester.com can help you test it. Then send tests to proton or corrupt gmail, ect
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I’m wondering if the warm up process is more challenging for a VPS since it would be a new mail services vs some of the other providers like Skiff and proton
Warm up process meaning how long it takes to turn on? You're running software on a vps that has setup time
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Warming up meaning sending sufficient email traffic that is recognized as not spam by other service providers so that it can be used for any purpose including business. It is very common for new domains to be marked as spam if they don’t do it properly