Buy 2 pieces of shungite (50 GRAMS) glued(blutak) a piece of Herkimer diamond (3 grams) on top of the shungite...For a few bucks you will be happy...
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I would put linear power supply on the router first because that is part of your internal network and chains together things like music server, player, DAC, etc. The modem would just be another piece on the internet interface. You can't put linear power supply on every single piece of the internet, lol. The modem is also an additional step away from the Lumin, so anything in between would help filter noise.
An alternative which may be less expensive, is to use a separate power conditioner to to clean up the digital gear. Here’s my current thinking: