Which External Linear PSU Upgrade for my Router?

YesI got this started long ago ,call linear tube audio they have a great LPS 

retail $750 you just tell them the voltage. Their LPS can go up to 8 amps

 routers - modem combo are around 4 amps at most.

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.