Which External Linear PSU Upgrade for my Router?

What is the goal in using a linear PSU as opposed to say, using a power conditioner?

I'm using the exact sbooster model as pointed out above on my router. Can't say I hear a difference, it was an extra power supply I had lying around is why I'm using it. Makes me feel better is all. 

I use this. It has 2 outputs if you need to power something else that's the same voltage. I got the premium version for the extra couple bucks.

https://www.aliexpress.us/item/3256805431512321.html?

I replaced my two (modem and router) LPSs from Aliexpress (complete with iFi DC Purifier and Bybee iQSE) with a 12V deep cycle automotive battery, which is only charged when not playing music. Moved my listening experience from mid-audience to front row seats!

I'm convinced that digital electronic equipment (in particular) are hypersensitive to the quality of input power and acoustic vibration. 

For routers, switches and NAS, I have found some LPS do not work so well, and can be worse than the included SMPS. I think its due to the fast high frequency nature of the network switches.

But some of those LPS that did not work well with switches were fantastic with DAC's and streamers. So you need to experiment and not presume any LPS is an upgrade..