How much it cost to install cctv with paradox alarm for a dsth ?

Guys need some help on the following...

1) for windows without grille... Do you put magnetic or shock sensor ?

2) for windows with multiple opening, do you need one sensor fir each opening ? Eg the window is stiitting on one window frame but you can open only half of if as it is made of two windows panel.. Some even come in 4 pieces (2 big panel and two mini panel at the top).. So one frame one sensor or every panel one sensor ?

3) where do you all put PIR ? I'm planning one at the car porch... One for jackroof... How.many is needed for roof ? Was thinking whether it is needed in the living hall, backyard and 1st floor living hall...

Appreciate some inputs from you all.. Cheers 😊