The only good scanner is your frontal lobe. Most scanners are a scam prying on fear of the uneducated. Every smart device is a potential attack vector, and there are two class of entities that can use your device maliciously. Black hat hackers that put malware for residential proxy services or manufactures selling data to advertisers. There are ways to mitigate the risk like air-gapping, putting them on separate network, jailbreaking and buying dumb devices.