You are right of course - in the UK you would also have to have a safe extractor/collector unit for the fumes/dust - however the US made table top models
are self contained - BUT you only have a A3 sized bed whereas ours has an A1 and can take objects up to a foot high for engraving, plus a rotary attachment for glasses , bottles
etc. The water cooler is a separate unit which now costs the better part of R10k. Better half had her aluminum tubed Universal 200 re-gassed (they run on CO2 at about 38kv - at 80w so minimal current) and that set her back about R80k some 22 years ago. Pyrex type glass tubes
are only about R12k now however.
You also keep the lid tightly closed unless you are an idiot - plus they all have a safety switch to shut the laser off if the lid is lifted (which I have seen bypassed). There is always some stray laser beam about and deflection off the bed which does not do one much good. Especially eyesight. So the machine
has a thick dark yellow/orange perspex inset on the lid and you should wear safety type glasses the same coloration which act a bit like polarised lens.
As a matter of interest ours ran for a year in the spare bedroom - with the extractor unit venting through a french door panel - would be severely frowned upon by 'elf & saveless'.