I have what I would describe as "minimum moderate" UI. When I tried External condom catheters, with highly meticulous technique, and using the 70% more adhesive ones, carefully sized to be correct.
The results? As a side sleeper, I had a bag hanging behind the brass rail bedboard, which was as perfect as you could have it situated. No kinks of any kind. I checked it for TWO hours before going to sleep on one side, and then I woke up in an hour - everything fine.
Then, I carefully turned to my other side, with no kinks, moving the tubing to my other side, making sure everything was PERFECT. WHAT HAPPENS? Within minutes, I feel urine leaking into my diaper with its additional thick stick on pad. I pull the bag to rush into the bathroom. The condom was leaking at that time, though still on. I had to quickly unroll it, so urine wouldn't get over the floor.
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MY BED? Urine leaks on my fitted sheet, on the mattress topper pad, and even into the memory foam topper!
After that, I said NEVER, EVER again will I touch a condom catheter.