Question i wifi LAN 3 devices to connect-what hardware pls

[ldfart]

pc wlan0, 3d printer and cctv with only rj45 sockets. usb ports occupied. i have one rj45 to usb adapter. modem/router is tp a1200. can i get 2 externally set up wifi dongles fast enough for live streaming video, or without password and router block both from internet? i have a second modem/router, too if it'd deniedvinternet except thu pc, can i block internet to printer and cctvv? os is puppy linux
will this do, pls?
NETGEAR AC600 Wireless USB Mini Adaptor
edit
modem #1 wifi to pc
modemv#2 wired ethernet to 2 dumb devices. needs dongle to make wireless.
will AC600 do if on rj45 to usb adaptor?
thx