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[Hide] (325.8KB, 1000x1422) cages are very personal so you'll likely end up with a bunch in the search for the perfect one, it also depends if you just wanna wear it while being horny or all the time like a good boislute
good quality ones don't have sharp edges or burrs to catch your skin, read reviews, and always keep your spare key somewhere safe in case you lose your first key
The long ones that don't compress your pebis at all are easier to wear without a harness because your body won't push them away from you if you're erect, but they're also less cute.
Smaller ones and flat ones absolutely do need a harness if worn under clothes or pretty much any length of time, the cage will not sit flush against your body if you get an erection or have a healthy dick size in general.
Make sure there's enough room for your balls because some of them are too tight even with the largest included cock ring, too big and your balls will just slip out.
I should point out that getting your balls in place on smaller cages can take some getting used to, if you start feeling sharp pain or see your balls turning blue take it off immediately.
Flat is easy to get used to despite the memes, it's the inverted ones and urethral tubes where you start to dive into self-harm and pebis shrinkage territory, don't put chinesium anything into ur pee hole, they're not designed to be sanitized and if you have a nickel allergy or acquire one while using it, it'll be utter hell for your urethra, you also don't want the metal end of a plastic catheter tube inside of u.