Can I connect grenades with a detonator and use it as a ranged weapon in combat?

We’ve been dipping into Starfinder and I find myself playing a mechanic. I love the idea of using grenades to their fullest advantage, it’s a fun, volatile weapon that turns up as loot too often not to make use of. However, as we level up the average grenade is not as useful as one-by-one weapons and so I thought about connecting them with a detonator and using that as a ranged weapon, or as a dropped weapon that I set off when at a safe distance. A sort of "grenade bomb".

But first, the facts:

Detonators: This conical device primes and detonates explosives (including grenades) with a push of a button. Programming a detonator to a specific package of explosives takes 1 minute, after which the detonator can be triggered in one of several ways. The detonator can be set to ignite its payload with the simple press of a button (no action), a four-digit command code (a move action), or a complex input method, such as scanning your retina or thumbprint (a full action). You choose the triggering method when setting the detonator. A detonator detonates its payload only if it is within 500 feet, but some detonators can make use of signal-boosting technologies at the risk of becoming vulnerable to countermeasures like signal jammers and other effects. Explosives have the same price, effect, and weight as grenades (see page 183). If you successfully set an explosive on a stationary object with a detonator using the Engineering skill, the explosive’s damage ignores half of the object’s hardness. (SCRB, 219)

And:

Grenades: Grenades are thrown weapons that detonate in an explosive radius when they reach the target…The DC of the save is equal to 10 + half the grenade’s item level + your Dexterity modifier. Any penalty you take to your attack roll also applies to this save DC. (SCRB, 183)

Ok, now, from these descriptions, I think it’s possible. The detonator is a little bit confusing because it talks about grenades and explosives as separate where explosives can damage a stationary object. So I wouldn’t be using this grenade bomb to damage an object specifically. It would be against creatures.

Questions, and I’m wondering if this might just be GM discretion:

  • Would this grenade bomb be a ranged weapon or something that I have to plan and place? I.E. Could it be prepared in advance (takes one minutes, but doesn’t specify if that’s in battle or beforehand) and used when needed?
  • How many grenades can be connected to a detonator? Would there be penalties to my attack roll? How would one calculate the save against the grenade bomb?

Thank you all so much!