For ambiances recording, I almost always use the LCR setup in the Cinela blimp, this setup is composed of a Sennheiser MKH 8040 ORTF setup + 1 MKH 8050 added for ” Center ” channel, which is really nice to have once in the edit room.
I often add the excellent LOM Usi omni microphones to get another sonic perspective and more edit possibilities afterwards, so I came up with the idea of mouting the Usi mics inside the Cinela basket in a unorthodox “AB” configuration.