3-5 devices. Most times we have 1-2 devices running at the same time. My kids are young so the only time they use internet it to watch a tv show. Our internet seems very slow most days so a lot of times I go off Wi-Fi on my phone and use my unlimited data.

Do we really need to upgrade our internet plan to 150 mbs or do I just need to get Wi-Fi extenders for around the house?

Our internet use is just surfing the web or streaming Netflix.