Prefab ADU under 120sqft

A popular question in the archives but this is a dynamic topic with the state laws easing up all the time. I am wondering if anyone has current recommendations for an ADU company or recent cautionary tales. We are in El Cerrito, we know our site doesn't lend itself to a structure being craned in but we are otherwise interested in prefab as a faster construction option, we aren't even sure we want to go the full kitchen/bathroom route (for easiest permit streamlining) but may stay under the 120SF option for no permit (no bathroom). We also aren't even entirely sure what we would use it for, but with two teens and two parents constantly crashing into each other in a small house, feel like it would get used for something(?). Anyone else done some thinking on this? Finally anyone recently gone through the City of El Cerrito for a legal no-permit shed but gotten an electrical permit? Does the inspector really just look at the electrical work or do they start poking around everything? Thanks!

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We just got one of these put up by Type Five and love ours. It is 100SF (no bathroom) but we have a murphy bed in it and use it as an office most of the time (+peloton / work out area), but it becomes a guest room when family is in town. It's made our house feel so much bigger. There was no permitting necessary because technically it's a "shed" but has transformed how we live and feel about our home. Highly recommend Type Five!