Currently, we are using a mobile hotspot to run the Zoom meeting, usually attended by 20+ people every session. It's actually a hybrid meeting, some will attend physically at the shop lot, and some attend online. The connection tends to be very poorat times and not clear for the online audience.

1 option we are considering now is to check with our neighbour if we can rent their wifi, because we only use it for 3 nights (3 hours each)

Is there any other option that are available from telco that may suit our needs?

Something cheap and portable. are those thumbdrive broadband still available?

5g broadband perhaps? Umobile and YES are offering good pricing if you take the sim only option. You have to buy the router yourself which could be quite costly.

The 5g broadband plans are basically the evolution of those old usb modem plans from those years gone by

if your place has good 5g coverage, its a good choice

starts at rm58 for yes's plan, rm68 for umobile's and more for maxis/celcomdigi

the expensive part is the router though, those start at rm500 and only go up

umobile provides one for the same plan price if you sign a 2 year contract, while the other telcos want more for the router

well at least its portable so for the rest of the months you can use it elsewhere

Some argue what is the difference with the current setup, its still sim based internet.
Im sure using a router should be much more stable and efficient versus using a phone.

I saw some wifi sim routers for like rm80-100, with high numbers of sales - should be legit right?

Legit, but reliability not guaranteed. Who knows they will spoil in just 3-6 months or even less. Also, cheap ones don't have 5G support.
Better buy branded ones at least.

despite their names being like "4G/5G PRO" they dont support neither 5G Mobile data nor 5Ghz WiFi, its basically a scam
there's plenty of scams online for everything (hard drives, pendrive, sd cards, and even these)

the cheapest is around RM500, Nokia Fastmile for example

I'm using one of them for 3 years plus. Connected to an existing TPLINK CP1200 (ex Unifi router)
As what "PRSXFENG" says, the label says 4G/5G , but actually there is no 5GHZ wifi. So I'm using that TPLINK router to get 5GHZ wifi (and reduce the load for the modem) .

MY advice if you want to use that router , do change the power adapter that came with it, get a second hand DLINK / TPLINK adapter. You cannot rely on the quality of the adapter.

Performance wise highly depending on area and time.
The advantage of these "routers" is the ability to manually switch "Bands" if they are congested. And the reason its cheap is because they do not support Carrier Aggregation; it cant connect dual network bands at one time.

Seeing that you are trying to host Zoom, yes, Zoom highly dependants on the network at that time. I do connect to Zoom on weekly basis (as participant, not a host) so I know how it feels. Lagging sometimes. So what I do is to restart the modem as first measure. If cannot then only change the band.