Can't find the values of certain keys that are used as parameters while issuing post requests

I've created a script to scrape content from a webpage. When I navigate to the aforementioned link, I can see the total listing displayed as Results (10080). This number varies each time I refresh the page.

I can generate the number of results using the script below. To do this, though, I need to copy the values of l and area from devtools and use them as parameters while issuing post requests.

For total listings:

url = 'https://www.rentfaster.ca/api/map.json'

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36',
}
params = {
    'l': '4,54.9773,-112.766',
    'area': '59.68965038087162,-91.935921875,49.63882324278784,-133.596078125',
    'exclude': ''
}
res = requests.post(url,data=params,headers=headers)
print(res.json()['total'])

What I can't understand is how the values of l and area are generated, and how can I retrieve them using the script? To be specific, when I go for the city-wise listings, as in Calgary, AB, I also need to use values of l and area as parameters while sending post requests.

For city-wise listings:

url = 'https://www.rentfaster.ca/api/map.json'

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36',
}
params = {
    'l': '13,51.0452,-114.0764',
    'area': '51.058053440451424,-114.0356853316207,51.03236736163589,-114.11705282429648',
    'e': 'zoom_changed',
    'exclude': ''
}
res = requests.post(url,data=params,headers=headers)
print(res.json())

Question: How can I find the values of l and area that are used as parameters while issuing post requests?

from Can't find the values of certain keys that are used as parameters while issuing post requests