A tray only helps if it actually stops the setup from spreading. The best tray is not the most elaborate one. It is the one that keeps daily use controlled and easy to reset.
Quick answer
For most people, the right tray is small, easy to clean, and big enough for the daily routine without turning into a surface that invites more stuff.
Why a tray helps
A tray gives daily use one clear home. That matters a lot if your setup keeps leaking across a dresser, shelf, or nightstand.
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What size usually works best
Smaller usually works better because it contains the routine instead of inviting more clutter.
What to avoid
Avoid trays that become a permanent landing zone for every accessory you own. That is just organized sprawl.
Where a tray makes the most sense
Nightstands, dressers, side tables, and other surfaces that keep attracting the same few items are where trays usually help most.
Bottom line
A good tray should make the setup easier to reset, not just give the mess a border.