As far I know SAP doesn't support ProxmoxVE at the moment. Non the less there are people who managed to run SAP software on it, there was a recent discussion in the German forum:
Moin Gemeinde. Ich wollte SAP B1 / SQL auf einer PROXMOX Instanz installieren.
Leider scheitere ich an einem bekannten Problem, siehe unten. Haben wir hier jemand in der Gruppe der mir erklären kann, warum es daran scheitert? SAP supportet proxmox nicht, ich möchte aber wissen woran es klemmt. Bisher war das unserem Consultant wohl nicht bekannt.
Fehler:
Symptom
Wenn Sie SAP-Business-One-Serverkomponenten (SLD und Lizenzdienst) installieren, schlägt dies mit Fehlern fehl. Das Installationsprotokoll und das operative Systemprotokoll enthalten die folgenden Fehler:
It also linked this SAP website:
https://userapps.support.sap.com/sap/support/knowledge/en/3588295
Please not that it's aboout SAP Business One, not HANA but afik the state is the same.
It's a pity really since this basically forces people to be stuck with more expensive options (like VMWare), although they don't need most of their features.
If your goal is to save costs it might still be worth a shot to keep just the lowest VMWare subscription you can get for a minimal environment and migrate everything else to ProxmoxVE or another Hypervisor.
Interesting enough HANA seems to support SuSe and Redhat Virtualization which is (like ProxmoxVE) based on kvm/qemu (the Linux Kernel Level hypervisor KVM and the virtual machine software qemu based on it):
https://help.sap.com/docs/SAP_HANA_...dd60114463eb4ccaf6462e5ea24.html?locale=en-US
https://access.redhat.com/articles/4448131
https://documentation.suse.com/sbp/sap-15/html/SBP-SLES4SAP-HANAonKVM-SLES15SP4/index.html
So maybe it might be worth it to have just one Server with RedHat or SuSe just for SAP stuff. I would check with SAP whether their support is actually more than just that website though.