Preferred version. However, it will not work in the mobile browser. We would have to use a separate mobile form page and have two versions of the same form as seen below.
The version below is necessary because of mobile optimisation. Wix will cannot make the HTML responsive so the default form has to be made to a size that it fits in the mobile browser.
The button below is an alternative method. Clicking will bring up the 'lightbox' which holds the form. Therefore, you don't need to accommodate it in the website anywhere else. The button can be the element on show most of the time. We can also hide the desktop button on the mobile and vice versa so that both platforms can access the relevant form.