Renault did not offer a tow bar on the 172. It offered it on all the lower-spec Clios, but not the 172. The one with the biggest most powerful engine that you'd think would be the best for towing things. I wanted a car with a tow bar so I could tow a light trailer for things like taking rubbish down to the tip, and towing around a kart trailer. The dealer said there was no reason one couldn't be fitted, and supplied the car with a standard Clio towbar fitted. The first time I tried to tow a trailer I realised why Renault doesn't offer a tow bar. Because the Clio is front-wheel drive and the Sport has so much power and torque it has to have a tall low gear to prevent it wheelspinning. That plus the fact that it is fairly highly tuned means that its a real pain to launch off from a standing start with a trailer on the back, and doubly so on a hot day with the A/C on, and doubly doubly so if you're caught in stop-start traffic creeping forward uphill. In those circumstances you have to really torture the clutch. The engineers at Renault realised this and didn't offer a tow bar for a good reason. Take that as a warning from someone who found out the hard way. The Clio Sport 172 is NOT a good towing car. I don't expect the 182 would be any better. I actually got the engine chipped not to increase top end performance, but because it adds torque right through the rev range, even at the bottom, and that improves the 172 from a really terrible tow car to one that's at least OK.
The other issue is legality. I don't know what the law is where you are, but I moved states here in Australia, and found that in the state I moved to the law says that the factory handbook says what weight you can legally tow. So I have a car fitted with a Renault towbar by a Renault dealer, but the Clio Sport handbook says "no tow bar", so its illegal for me to actually tow anything. Check the law where you are.