Clarification: Using Same Private Key for Multiple WireGuard Servers

[efficient-side]

I'm setting up multiple WireGuard servers and aiming to configure them as peers within a single Wireguard client. I believe we need the same private key to configure multiple Wireguard servers as peers. Therefore, I'm curious about using the same private key while creating multiple Wireguard servers.

I plan to leverage allowed IPs within the client configurations to control which VPN connects to specific endpoints within the network.

I do not see an option to provide a private key during one-click installation. Would it be possible to manually modify the server configuration to utilize the same private key on each server?

Additionally, I like to understand the importance of private key security. If using the same key is possible, I'd appreciate any insights into potential security implications and best practices for mitigating risks.