When a German friend, who lives in Costa Rica, showed me a scorpion in an empty glas of marmelade, I could hardly believe that he catched it in his living room. However, when I saw some dangerous species under a stone I had turned around during the search for a treasure, I changed my opinion. It depends in which area you will live and which kind of house you have. The house of my friend is made out of wood and pervious to insects. Spider from the tarantula family can be found in his sink once in a while.
Tarantulas cause burning and itching and maybe a paralysis, but they are never deadly.
You need a lot of bad luck to get damaged from one of these insects. And even if it a snake will bite you, there is a big chance that it is not poisonous. They bite only for defense reasons. Note time of first aid as well as size and colour of the snake Steps like sucking, burning or ice on the wound bring complications why we can not recommend them. Scorpions are night hunters.