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Digital thermostat installation questions for electric baseboard heaters with manual dials

Hello. I have one TPI Corporation H2910-048SW Electric Baseboard Heater (1000 Watt, 240V, or similar, bathroom heater is smaller but same type) in each room of my 1 bed, 1 bath third floor apartment. I live in Western NY, US. 

My electric bill from National Grid last month was $192 which is *extremely* expensive for me and I'm looking for ways to use less energy while not freezing to death during winter. My last month's electricity usage was 1090 kWh. The previous month was 546 kWh.

I honestly can't tell if it's just really expensive to use the electric heat or if something is wrong with the heaters' wiring that's causing them to use so much electricity. I do not have a digital thermostat anywhere, just small manual dials on each heater in every room. I only turn the dials up like 1/4 of the way in my bedroom and living room to keep costs down, meaning my kitchen and bathroom are consistently cold (60F guessing). Like I have to microwave my butter a little bit to spread on my toast every morning; it's that cold in my kitchen. It's hard to keep the heaters off completely or the heat very low when I leave because I have two cats and I feel bad if it's too cold in here while I'm gone. 

I made a Reddit post asking for advice and someone suggested a using a digital/programmable thermostat. I read that the thermostat has to be a line-voltage one for electric baseboard heaters, so I found this one online:

Question #1: The 5th product image down shows the thermostat on a wall outside someone's kitchen, but the PDF manual itself says "Install the thermostat onto an electrical box" which is clearly not found on a wall outside a kitchen. Am I missing something? Where would the thermostat be installed? 

Question #2: How does the thermostat connect to the electric baseboard heater? Does it connect to the wires on the heater itself or the electrical box? 

Question #3: Do I need two thermostats for my bedroom and living room or will one thermostat connect both heaters somehow? 

Any advice or help is appreciated. Thank you!