Several questions

Hello.

1) Yes, its possible. You need to insert into the post or page this shortcode:
[bookingcalendar]

Please note, at this page must not be any other shortcode for booking form or availability calendar for the same calendar.

Please read more how easily insert booking form or availability calendar into a pages https://wpbookingcalendar.com/help/inserting-booking-form/ or how manually configure Booking Calendar shortcodes in content of your pages: https://wpbookingcalendar.com/help/booking-calendar-shortcodes/

2) Its possible in the Booking Calendar Business Small or higher versions. In these versions you can activate the range days selection mode: https://wpbookingcalendar.com/overview/#range-days-selection
where you can set start day of selections and how many days to select.
And also activate using change over days: https://wpbookingcalendar.com/overview/#change-over-days
using the same date as check in/out date for the different bookings.
Please retest it in the live demo here: https://bm.wpbookingcalendar.com/

Kind Regards.