You can use n to manage your node installs and to do the installation in the correct directory.

Node 14 example:

apt-get install npm
npm install -g n
export N_PREFIX=/opt/plesk/node/14 && n 14
plesk sbin nodemng register /opt/plesk/node/14/bin/node

Then go to you Node.js manager in Plesk and refresh the list of available node versions.