I have one of these and really like it. No need to buy a phone adaptor, this one holds both larger and smaller cells phones. Also comes with its own GoPro attachment too. $15.99 AVAWO Universal 12-Inch Mini Flexible Tripod with Wrapable Leg Quick Release Plate and Cell Phone Tripod Adapter

I use this one

https://www.amazon.com/gp/product/B013E0FIPY/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1

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I clamp in on to various stands, it's pretty strong...