Questions about B450M-A Pro Max

No, the MB has only one TPM connector: JTPM1: TPM Module Connector.
However, the matching AMD CPUs have an integrated TPM module. This can be activated in the BIOS. After a BIOS update, TPM should be active by default.
https://www.msi.com/Motherboard/B450M-A-PRO-MAX/support
It is best to update the BIOS to version 7C52v3I.

Here is the list of supported RAM modules: https://www.msi.com/Motherboard/support/B450M-A-PRO-MAX#support-mem-19
Some entries are even DDR4-4400.

To check compatibility, you can generally go to the RAM manufacturer's website and enter the name of that motherboard.

Yes it has. The slot is directly above the PCI-E slot.

Yes

Yes, it is compatible. Otherwise, the complete list of compatible processors can be found on MSI's website.