Nope. Just sign into the app store and download on each one. As long as you are signed into the app store, you can use and receive updates.
You have 3 Macs? Lucky you
Thank you djmagicmoments, yep you can use up to 5 devices with one license (all devices which you are allowed to link to your Apple ID).
Cheers,Lukas E.
Thank you DJMAGIC…