Technical questions about nRF54L15 before buying it

Hello everyone. I'm planning on buying multiple nRF54L15 boards for a college project, which is based on channel sounding. I'm considering rn 1 tag board, along with 1 dev kit, and a possible second dev kit. My technical questions are related to timing, capabilities and other required hardware.

Timing: during normal load, what is the expected timing between Channel sounding "first packet" send and data measurement obtention?

Capabilities: During my search, it became clear that simultaneous multi-reflector channel sounding is impossible (and makes a ton of sense, honestly). If I were to use 2 or more reflectors, would I have to do connect-measure-disconnect or would I be able to hold multiple device connection with different reflectors and measure one at a time? In case it's the first, how would it affect that extra load to timings?

Other required hardware: after looking at the spec for the dev kit, I've seen the embedded antenna it has. Would it be needed/recommended to have an external antenna on the dev kit when being used as a reflector? If so, recommendations are welcome. I've seen the tag, and the whole package looks promising for what I need

Those are my main questions. Any useful comment is welcome. TIA

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