Generally, there are three main reasons why male cats urinate inappropriately. First, they may be stressed due to external environmental stimuli. Second, physiological factors such as being in heat can cause them to urinate everywhere. Third, pathological factors, such as urinary tract diseases, can also lead to inappropriate urination. The best solutions for these are as follows:

1) Spaying/Neutering: If you don't want your male cat to go into heat, you can consider spaying/neutering him/her. This not only reduces the risk of various diseases, but also prevents him/her from urinating everywhere when in heat.
2) Keep the litter box clean: Pet owners should clean the litter box regularly to keep it clean and hygienic, which can effectively prevent male cats from urinating in other places.