Get help. I've experience of a better machine than this crippled and useless because of poor installation.
100mm pipe runs are too small. The machine needs a single connection and main pipe in 125mm, kept as smooth and short as possible. Y Branches and blast gates to just two or three machines that really need it.
If you have more than two blast gates open at once (and your users will all want to use it at once) it will be useless so only connect it to the essential planer + possibly sander + AN Other.
Get an NVD750 for the tablesaw crown / blade guard otherwise let the dust fall in the tablesaw cabinet and just hoover it out every few days.
NVD750 can make a big difference to a bandsaw too (users like those because they aren't as scary as the tablesaw but are good at breaking them, you need a biggish floorstander with a 3/4" 3 tpi blade that's hard for them to snap) but only if it has a dust port positioned just below the table (waste of time if the only dust port is at the bottom of the cabinet).
Mitre saw needs a high suction (NVD750 or shop vac) connected to the blade guard port. That does all the heavy lifting and nothing else matters. Attaching the Axminster machine you've chosen to a sliding mitre saw is an utter waste of time. It won't work.
CNC router in a small workshop: you will come to hate the whine of the machine. The noise over extended periods is offensive and will inconvenience everyone in the shop. Look at putting it in a noise enclosure. There may be some value in extracting the entire enclosure with the Axminster, but really you need a brush type dust shoe around the cutter connected to an NVD750 / shop vac type machine to create high suction and high velocity airflow immediately around the cutter where the dust is produced. Far more effective.
Don't waste your extractor on a wood lathe. It's super INefficient extracting a lathe so make the users wear PPE and save your valuable airflow for a tool where it makes a difference.
Shed users love belt and disc sanders because they are easy. These create buckets of fine dust and only your HVLP extractor moves enough air to have any effect extracting a big belt sander.
You already know the planer is the machine that needs this extractor the most. Don't let people plane pallet wood please. They will save a few pennies. Everyone else will be subsidising them by paying for new blades and extra sharpening when they plane through nails, screws and embedded grit ...
Pallet wood is the antichrist to maintaining your machines in any decent state of repair and accuracy.
Lastly - vet your prospective safety company thoroughly. There are some out there who are utterly incompetent. Be highly sceptical and ask to visit a couple of reference customers before hiring them.
All of this from having been where you are and seen it done wrong in so many ways ..
