Firstly forgive me for my lack of knowledge on this subject.
The scenario is that I have a domain example.com. This domain is hosted on 192.168.1.100 for example and is the main domain for a company website.
I wish to also have a customer portal but intend to host this on another server that I have more control of. The subdomain will be customer.example.com and will be hosted on 192.168.0.100.
The servers are in different locations, but can communicate with each other over the WAN.
I need to get an SSL certificate that will cover both the domain and subdomain and as I understand this I require a wildcard SSL.
My question is whether it is possible to purchase a wildcard SSL that can be used over multiple servers. I have tried to look for some info on this, however, most of my searches return information about multiple SSL certificates on one server. If anyone can give me some advice or point me towards some guides/documentation, it would be much appreciated.
Note I use linux based servers with apache.
I do not need a product/service recommendation as I have a provider in mind and understand that this is not the purpose of SE sites.