I tried two for the 1st time last year. Read, previously the trick is to keep it moist and use heavy mulch or moss. I mixed 1/4 good potting soil, 1/4 composted Cow Manure (bought in bags at a garden store) and 1/2 moss. Results were not spectacular, but got a few good tomatoes, peppers turned out great. Like others comments, you have to monitor daily or every other day, just water. Problem is hanging upside down, all the water runs into the tomatoes and some burst open.
My small garden plot gets great tomatoes every year. I use ½ a (40 lb) bag of composted cow manure to fertilize each plant as I plant them. I wait until Memorial day to plant outside, but container grow to plants 10”-15” tall.
I break off all the leaves/side stems up to leaving just 4-leaves/stems at the top and plant them so the soil is within a ½ inch of the lowest leaves as all of the stalk/stems below ground will take root. I plant like varieties 4ft apart and other varieties 6ft-8ft away. I mulch with grass on top of landscape fabric, from the mower/bagger to keep the ground moist and cool/weed free. I move the grass mulch around every week to keep it dry, from mold starting and from weeds starting to grow.
I usually use the heaviest cages (30”dia./4ft high) you can find and end up staking with 6ft steel t-posts and add bamboo or other secondary stakes/posts. My tomatoes in the ground end up 6-8ft tall/4ft diameter. 4-plants is all we need to have plenty to eat and freeze (Freezing is much easier and faster than canning).
I’ll use the topsy/turvy baskets again, but only for peppers to keep them away from the rabbits.
Good Luck.
PS: I dig holes 24″ diameter and 18″ deep for planting. Filled with cow manure compost, grass, leaves, moss, potting soil and soil dug out all mixed together. I do not use any other fertilizer.
PS2: I have been gowing tomatoes for over 15 years like this. Location requires 75% or more Full Sun.