Hello,
1. You would need to hire a Linux server with adequate system resources. Check the requirements for Bitcoin core.
2. Then, follow any installation instructions for Linux. For example: https://bitcoin.org/en/full-node#linux-instructions
3. Finally, follow the plugin-specifc instructions: https://github.com/dashed-slug/wallets/blob/master/docs/install.md
The plugin-specific instructions ask you to setup the bitcoin daemon as a service.
You would also need to setup automatic backups to your wallet file in a secure manner.
Finally, it’s not strictly necessary, but would be a good idea to harden your Linux installation’s security. How you do this depends on your distribution. For example, if you are on Debian: https://wiki.debian.org/Hardening
Start by installing Bitcoin core on a Linux server and let me know where you get stuck.
Please note, the advantage of this plugin is precisely the ability to connect to full node wallets. If you find it difficult to install and maintain a full node wallet, I am unable to undertake this for you. You may need to hire someone. However, I am always available to answer any questions you have about the process.
with regards