Developement server setup - Users with Developement robot licens?

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Studio/Robot version: 2018.1

Current behavior:

We have a development server today where all developers login and use the same Studio installation (high density robot setup). Each developer('s studio instance) is connected to the Orchestrator using the non-development robot license.

I would like to know:

Is this the correct setup recommended by UiPath (or) is it possible to buy more of “Development robot” licenses so as to replace the non-development robots with the development robots. Our aim is to connect the Developer to the Orcheastrator for publishing the job, so a development robot should solve the purpose.

Logically/Probably a Development robot costs less than a non-production robot, so may be there is a gain on the economy side as well.

In short, I would like to know if it’s possible to purchase more “Development robot” licenses from UiPath in addition to the default(1 or 2 based on the Studio version)?