They might be more effective, but you can always compensate by chucking more a more powerful one elsewhere, if it's not practical to have one directly above.
A couple of hundred on a chonky extractor, versus a couple of hundred on a cooker hood, plus a couple of hundred on the ducting and install, plus the sheer ballache.
Surely depends on how far away?
Water vapour and smoke, I would agree, you could have on the other side of the room, like a bathroom extractor,
But for airborne grease, I would have thought it would deposit on way more surfaces unless it’s sucked through a filter closer to where you’re cooking.
They might be more effective, but you can always compensate by chucking more a more powerful one elsewhere, if it's not practical to have one directly above.
A couple of hundred on a chonky extractor, versus a couple of hundred on a cooker hood, plus a couple of hundred on the ducting and install, plus the sheer ballache.