We went for a Tommee Tippe one with the breathing pad.
IMO the pad is nothing more than preying on your fear, nothing but bother EVERY time it sets off the alarm because the child has decided it doesn’t want to lie on a sub-A4 space on the bed. Quickly got removed once she left the treasure cot and went into her own cot-bed.
With IP cameras you need to make sure it’s secure, read too much about how easy it is to hack them and have all sorts of folk watching you or screaming obscenities at your sleeping kip (the ones with speakers). You can make a ghetto monitor with an old laptop, a hardwired webcam and skype which works rather well, you just need to set it up to automatically recieve calls whenever you dial in.