Is ther any way to make the logo slider similar to https://buffy.co/?

Sorry, no it can't do that.

Actually, I was wrong. It's possible with template style 4 and turn off the stars and date. Upload the company logo as the Avatar. Then use this custom CSS in the template.

h3.wpproslider_t4_H3_3.wprev_preview_tcolor1_T4 {
display: none;
}
.wpproslider_t4_IMG_2 {
border-radius: 0;
height: unset;
}




It ends up looking like this...