Multiple pet questions

Hello there! All of the "vintage" MapleStory pet guides do not seem to answer my doubts, so I thought I could ask here.

1- Will multiple scrolled stats on pet equipment stack? When I try to change a main pet it says "the speed/jump stats of the Boss pets will be the ones that apply". However, I placed my pet with equipment as secondary pet (with my Boss pet having no equipped item at all), and I still got the increased speed from its scrolled item. Could it be that maybe multiple pet scrolled items might give multiple pet stats after all? I would like to read the anecdotes of people who have tried this.

2- Will my extra pets require their own "Magic scales"? Or can they use the Boss pet items?

3- I've read somewhere that the Boss pet item ignore applies to every pet I own. However, I have also read that it is possible to have 20 more pet ignore slots by buying two "Item Ignore Pendant", and that whatever I wrote in those would work for every pet. Is that true?

Thanks to anyone who can answer.