I have been thinking about this for a bit now
There is a lot to consider before ordering, your location, elevation of your antenna, the locations of other miners around you and which dB antenna to use. Ideally you would want your hotspot to witness at least 40 other hotspots at least 300m apart or more, to get maximum rewards each day, also the protocol goes through halving every 2 years, the first having took place on august 1st.
I think right now its best to hold off from ordering a miner until these new suppliers entering the space start offering "lite-hotspots", the level of demand for these has been insane and the shortage of hotspots available has been compounded by the semiconductor shortages. There are back orders spanning 6 months with Nebra for example, crooks on ebay are selling Pre-Orders 3 times the usual price, and used hotspots are being sold still locked the previous owner's wallet (there is no way to unlock these without the previous owners releasing them). I ordered one of mine from bobcat based in china who are only accepting purchases with crypto, I have been running it from home its made enough to pay for itself and the other two I have on back order from calchip and nebra. I plan on running one from my office in the city and giving the other to my nephew when they arrive.
There are other iOT devices out there, similar project and competitors,
MXC Foundations which im still considering, but I need to hear more about "Miner Health" and "Miner Fuel" they introduced recently.
Nodle, best to run an on old android device with wifi connection (this token has not been valued yet but will towards the end of the year)
DeeperConnect offer a decentralised vpn (DPN) hardware they claim that they will be selling an antenna addon which will also mine HNT as well as mining DPR tokens for being a node on their DPN network. mainnet will go live soon and we will see what the rewards look like for genesis miners over the coming months.
Planetwatch: takes readings of local air quality and rewards miners with PLANETS tokens, not sure what the returns are like on this.
Amazon sidewalk: anybody who has one of those Alexa speakers or the smart doorbells with the built in cameras most likely has this activated and isn't aware of it, they are basically providing a similar service for amazon but not being paid for it, maybe in the future if enough customers opt-out amazon will offer discounts or vouchers if people opt-in.
Pretty much all ios devices have this activated its how find my iphone works; uses Bluetooth bounced off other local iphones in range and not purely gps