$500 via Verizon e-gift card (sent w/in 8 wks). Activation of 4G LTE/5G phone on 5G Get More plan req’d. Device must remain active for 45 days. $500 charge back if service cancelled w/in 12 mos or eligibility req’s are no longer met. See vzw.com/bring-your-own-device for details.
Any Wi-Fi extender works. They're built to standards. Make sure it's not a problem with the signal to your router first before you go out and buy an extender. The extender can make problems worse if your signal is already strong to the router.
If you have devices closer to your router misbehaving, or even wired in for that matter which misbeave, we should look into why.
Also, what router model do you have anyways? It should say on the the sticker underneath the router.