Siege, Earthrise. Both Transformers toy lines with heavy focus on Micromasters. Earthrise even makes a point for multiple Micromaster bases in it's ranks. Let's go a few lines back, Power of the Primes and Titans Return, also featuring small toy play. Titanmasters in fact had very similar play features and so may of the larger bots in Titans Return had base modes.
I'm making a badly formed case for Grandus to make his return. Look at him, a toy so wonderful they came up with a new way to say grand. He'd be perfect, he'd be wonderful, even grand. Honestly, I don't know why there isn't a Grandus sitting on the shelf of my local Walmart. Hasbro could be coy. They could disguise him as one of the G1 reissue line. The more legit members of society would get it. We'd know what the score is. I'd even go buy some grands biscuits to make it a thing. I'd have a grand ass day.