There is absolutely no advantage to running multiple SSDs unless you require a) more storage space than one will allow or b) you are able to format them as RAID 0 for increased speed if your PCI architecture allows for more than 4 lanes on the bus (most can't). With a typical 4 lane bus, a single blade is faster than RAID 0. You can get them up to 8TB if the cooling is good enough.

NVMe 3 x4 m.2 blades come in inexpensive 'slow' such as the Crucial P2 or expensive 'fast' types such as the 970 EVO.

BIAB 2024 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia, M1 MBAir, 2012 MBP
Digital Performer11, LogicPro, Finale27/Dorico/Encore/SmartScorePro64/Notion6 /Overture5