For example:


  The word rarely turns up outside of those contexts.
  
  The word turns up rarely outside of those contexts.


Which one is correct and why?


Question: How can I better protect my LAN from Internet Hackers
Answer: Placing a second firewall in front of your current one would offload some of the processing of scans/probes/attacks and free up CPU cycles on your Netgear router/switch/AP. Just get another Netgear and configure the two devices to talk to each other.

BUT, I do not have high hopes that this will accomplish what you seek. It is unlikely that your Netgear is so overwhelmed that it cannot properly handle legitimate traffic. Look to see what the actual problem might be. Too many machines communicating at once? Line noise/interference? Infected machines sending bot traffic?

Set up Wireshark on one of your wired machines and on a wireless machine and see what is going on on the line.