Can a linear power supply be used for multiple devices?

So long as the voltage is the same, and the current limits are not exceeded, sure.

https://amzn.to/2Y3gXfB

So, if you have two 12V devices, and each needs 1 Amp, then your power supply needs to put out 12V at 2A or more.

With the Astron you'll need to wire your own jacks.

Best,
Erik

Forgot, if powering multiple devices, using snap on ferrite beads can be helpful.

I got an HDPlex unit that offers 4 different outlets with adjustable output.
There are other manufacturers that offer 2 or 3 outputs, as well.
B

W4S has what your looking for called the LPS 1 I believe. You can power up to 4 devices with adjustable voltage for each module. The modules are sold separately from the LPS 1. Check there website out.