Currently i have a modem+router provided by the ISP which supports 802.11 b/g/n and plan is 100 mbps down and 20 mbps up. I have a total of 10 devices connected to the internet via wifi. 3 laptops, 1 desktop, 4 smartphones and 1 chromecast (All of them support ac wifi). Ever since the corona lockdown i have been experiencing speed problems because at minimum 4 of the devices are being used at once. So, what wifi router should i upgrade to?. Points to consider: I have a medium to large house with 6 inch thick concrete walls, My max. budget is 300USD, high bandwidth for sharing media among home devices.