Sentinel Stacking

Ok, I will ask everyone to chime in, but soliciting advice from @Dan, what is the best vent fan system exhaust and intake you have come across, the requirements are fairly simple remote temp sensor (30+ feet distance), flexible hose, move as much air as possible but not to exceed 40db under moderate load, should have a normal operating noise level close to 20db, reliable.

Should I plan for 2 larger and if so whhere should I measure the temp or 3 smaller units again where should I measure the temp, my thinking is 2 and measure between the Amp and Sentinel but I need to find out the largest diameter hose I can run first.

If I use IsoAccoustic Neo’s under all equipment I think I can use perforated steel shelves for the back 85% and wood for the front 15% this would allow me to use forced air from below , the next question then becomes dispersal pattern, shoould I use a single rectangular ent centered or a series so the entire compunent sits over the vent system, the first will have a higher velocity but a smaller coverage area.

Should I attach the probes to the top (harder) or side (easier)?

Extraction as close to the ceiling (let the air rise naturally) or as close to the components as possible and if so 2 larger units for the cabinet or 3 smaller so they have more granular speed controls?