Is it possible to purchase a wildcard SSL certificate and use it on different IPs?

Question

Digital certificates

There is DNS, on which several A records with different IP addresses are registered under one domain, for example node.example.com.

Each of these IP addresses is assigned to its own separate host:

node1.example.com
node2.example.com
...
nodeN.example.com

Each has its own Letsencrypt SSL certificate.

Is it possible to make it so that when accessing node.example.com, the certificate is recognized as valid?
Is it possible to purchase a wildcard certificate and use it on different IPs?

Answer 1

certificates are bound to domains/realms, not ip addresses.
That is, the answer to the second question is yes.
the answer to the first one is to get a certificate for node.example.com as well; it doesn't cost you anything anyway.