Good morning. I hope you are well. I’m having trouble streaming TV upstairs in the apartment. (Spotty and pausing frequently) Really want to avoid getting separate WiFi for apartment.

Is a booster likely to help? If so, would you recommend the booster below or do you have another recommendation? Thank you!
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I do not recommend third party extenders to existing wifi networks. I call that my cardinal rule of networking. "Never extend one router with a different manufacturer's router." Now you may purchase that product and have good results but based on my experience, I would not invest in a third party extender.

Other options would be to add on a completely separate network on top of your existing ISP provided router. Two router systems I recommend are:

Orbi by Netgear
Velop by Linksys

You can buy smaller variations of either that are less expensive since you're not trying to cover several thousand square feet.

The router provided by your ISP is never a great router as a stand alone. In other words, your Internet Service Provider's job is get the signal TO your house. They don't care about your wifi strength once it's in your home. That's the home owner's responsibility. The reason they take this stance is because every home is different and they can't guarantee the quality of the wifi signal throughout every home. Older homes contain plaster walls. Some homes have an excess of mirrors which is also a major deflector of wifi signal, and so on.

In my experience, wifi "boosters" are usually the cause of whatever problem I've been called out to solve. Unplug them and the next thing you know, the wifi network is healthy again. As I said, you may have a different experience but my professional advice is to not buy one.

P.S. the link you shared for that product was shady as heck. I would not buy anything from that website.