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Hi @Dellron30 and welcome to the Spotify Community!
Spotify can be installed on as many devices as you like. And up to 3,333 songs can be synced for offline listening on up to three devices at a time.
However, you can only stream music on one device at a time. If you begin playback on another device, the playback on your current device will be paused.
To add multiple accounts to one plan, you need to have the Family subscription: https://www.spotify.com/family/