LOL... Easy there Ray!
No, I use traditional S/H container, two holes on side, flush each time. The holes for the reservoir are just above the lip of the tray. Main issue is making sure none of the holes point outward. Big mess on floor if I make that mistake, which I've done. I try to line each pot up so the reservoir holes point toward the side of the next pot over, and when I get to the corner face one back, then line up on the other side.
The drain pipe sits slightly above tray bottom, so it leaves roughly less than a half inch of water at far end, and about a quarter inch at drain end. (I slope each shelf one "click" higher on one end.)
I have the drain through the floor, as I have a LOT of plants and flushing each one twice a week equals a LOT of water going through.
I don't get the comment Emma, about using one tray per shelf without some other barrier. Each pot having it's own saucer inside a tray? What would be the purpose?
Of course, I've only been doing this for around twenty years and never had rot/disease from doing it this way. Now that I've said that, everything will likely turn black and drop its leaves by end of week.
No, Dolly, black boot trays. They're the perfect size to completely cover each shelf. And thanks, it's super low maintenance compared to some other ways I've experimented with.