Compact and UPS-friendly 1x1 loaders. Works with train cargo wagons, circuits, filters, and modded belts from Bob's, Krastorio, FactorioExtended Plus, Space Exploration, and Ultimate Belts.
Like 2 loaders per 2 underground belts or 1 loader per 2 underground belts.
Because I tend to Ctrl click and make all the loaders at once then get paranoid over some orphan underground belts because it's an odd number.
This is why I recommend automating miniloader construction in your mall instead of making them by hand. But I understand that obsessing over an odd number of undergrounds in inventory can be stressful. I'll consider a mod setting to double the recipe costs and results in a future version.